Seeking Feedback: Evernote, Diggo, Delicious?

Hey HASTACers,

I'm working on an overseas collaborative project that requires us to place and access documents we encounter on the web in a single location. I think of the object we'll be creating as a password-protected "Internet archive," but that might not be the correct or most useful term. In any case, we've discussed using Evernote for this pupose, or perhaps Diggo or Delicious. I've tested none of these programs yet, so your feedback will be really helpful here.   

A few questions:

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